Most listings are in the $20's per square foot per year. The Bellevue region is seeing a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 38 listings have been listed, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 6,320 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this area were built in 1986 and are Class C.